398566257 has 8 divisors (see below), whose sum is σ = 545784576. Its totient is φ = 258529392.

The previous prime is 398566247. The next prime is 398566261. The reversal of 398566257 is 752665893.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398566257 - 2¹⁶ = 398500721 is a prime.

It is a super-2 number, since 2×398566257² = 317710122437980098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (398566247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1795233 + ... + 1795454.

It is an arithmetic number, because the mean of its divisors is an integer number (68223072).

Almost surely, 2^398566257 is an apocalyptic number.

398566257 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

398566257 is a deficient number, since it is larger than the sum of its proper divisors (147218319).

398566257 is a wasteful number, since it uses less digits than its factorization.

398566257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590727.

The product of its digits is 2721600, while the sum is 51.

The square root of 398566257 is about 19964.1242482609. The cubic root of 398566257 is about 735.9249200991.

The spelling of 398566257 in words is "three hundred ninety-eight million, five hundred sixty-six thousand, two hundred fifty-seven".